How to Calculate Your Resting Metabolic Rate
There are several different equations for calculating RMR.
By far the most common is the Harris-Benedict equation. This formula uses your gender, height, weight, and age to predict RMR.
Male: 66.47 + (6.25 x weight in lbs) + (12.71 x height in inches) – (6.755 x age)
Female: 655.1 + (4.347 x weight in lbs) + (4.07 x height in inches) – (4.676 x age)
Another way to find RMR is the Katch-McArdle equation. It uses only your lean body mass.
370 + ( 9.818 x lean mass in lbs)
Which Equation is More Accurate?
Despite being much simpler, the Katch-McArdle equation is almost always more accurate. The reason is that it’s based on the amount of muscle you have.
You see, muscle mass has the biggest effect on your metabolism. So my RMR calculator uses a modified Katch-McArdle equation to find your resting metabolic rate.